Fuel-Tech - Flue Gas Conditioning Electrostatic Precipitators
Flyash precipitators do not operate effectively when there is not sufficient sulfur trioxide (SO3) is not present in the flue gas. By injecting SO3 and, in some cases, ammonia into the flue gas the performance of Electrostatic Precipitators (ESPs) is improved without increasing SOX emissions. The conditioning gas necessary for the FGC process is produced by burning elemental sulfur to produce SO2, which is converted to SO3 with a catalyst and injected into the flue gas at levels normally less than 20 ppm.
Improve Performance of Electrostatic Precipitators (ESPs) and Capture of Flyash and Particulate
- Injection of SO3 and ammonia into flue gas to improve operation of Electrostatic Precipitators (ESPs)
- Reduces flyash resistivity and improves ESP capture of fine particulate for reduced opacity and emissions
- Technology proven on over 500 ESPs worldwide
System installation costs can be greatly reduced by designing modular equipment. Whenever possible, Fuel Tech system design is “containerized” by factory-assembling the process equipment inside a permanent enclosure prior to shipment. This minimizes installation time and expenses, and negates the need for separate, dedicated buildings.
Chemical feedstock costs and external energy input are significant. As such, catalytic converters should be as efficient as possible to minimize the flow of molten sulfur feedstock to the system, as well as, the cost of unused chemical exiting the stack. For this reason, the standard catalytic converter is a two pass design and 95% conversion efficiency is guaranteed. All systems are designed for high SO2 and SO3 gas concentrations to minimize external energy input and reduce the size of the field-installed piping needed to transport the conditioning gas to the injection probes mounted in the ductwork.
Systems
There are two sulfur options: molten sulfur and pelletized dry sulfur technology. Ammonia systems can be operated independently or added to SO3 injection for "dual conditioning." The system best for you is unique to your operation’s capacity and flyash conditioning needs, as well as, the type of coal burned.
Molten sulfur is the most economical and common feedstock in the United States and commonly available in bulk shipments. It’s non-hazardous and allows complete combustion within sulfur burner. It is reliably and accurately metered and transferred to the burner; as well as, heated to temperature with plant steam or from a small, electric steam boiler.
Equipment Sequence:- Molten tank
- Metering pumps
- SO3 Production
- Air blower
- Air heater
- Sulfur burner
- SO2/SO3 Converter
- Injection probes